Texas Instruments ADCx140EVM-PDK Series User manual

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ADCx140EVM-PDK
User's Guide
SBAU335–May 2019
ADCx140EVM-PDK
This user's guide describes the function and use of the ADCx140EVM-PDK. This document includes the
hardware configuration instructions, a quick-start guide, jumper and connector descriptions, software
description, schematics, and printed circuit board (PCB) layout that demonstrate TI's recommended
practices for these devices.
Contents
1 Introduction ................................................................................................................... 3
2 Hardware Overview.......................................................................................................... 3
2.1 AC-MB Settings..................................................................................................... 3
2.2 ADCx140EVM-PDK Hardware Settings ......................................................................... 9
3 Software Overview......................................................................................................... 12
3.1 PurePath Console 3 Installation................................................................................. 12
3.2 ADCx140EVM GUI Installation.................................................................................. 13
4 Quick Start .................................................................................................................. 15
4.1 Configuring the Audio Serial Bus for the I2S Output.......................................................... 17

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4.2 Saving a Configuration ........................................................................................... 19
5 System Overview........................................................................................................... 20
6 Schematic and Bill of Materials........................................................................................... 21
6.1 ADCx140EVM-PDK Schematic and Bill of Materials......................................................... 21
6.2 AC-MB Schematic and Bill of Materials ........................................................................ 24
7 Matlab Audio Capture Example .......................................................................................... 29
List of Figures
1 AC-MB Audio Serial Interface Routing.................................................................................... 3
2 AC-MB USB Audio Setting ................................................................................................. 4
3 AC-MB Optical or Auxiliary Analog Audio Setting....................................................................... 5
4 AC-MB External Audio Setting............................................................................................. 6
5 AC-MB Connection with External Audio Serial Interface............................................................... 7
6 Power-Supply Distribution of the AC-MB................................................................................. 8
7 TLV320ADCx140EVB Input Architecture................................................................................. 9
8 TLV320ADCx140EVB Connection for Line Input Application ........................................................ 10
9 TLV320ADCx140EVB Connection for the Onboard Microphone Test.............................................. 11
10 PurePath Console 3 Installation.......................................................................................... 12
11 PurePath Console 3 App Center......................................................................................... 13
12 Initial GUI Configuration................................................................................................... 13
13 Audio Config Tab........................................................................................................... 14
14 Hardware Connect ......................................................................................................... 14
15 Audio Configuration........................................................................................................ 15
16 MIC Bias Configuration.................................................................................................... 15
17 Standby to Active Mode................................................................................................... 15
18 Disabled Controls in Active Mode........................................................................................ 16
19 Audio Serial Bus Tab ...................................................................................................... 17
20 ASI Format Configuration ................................................................................................. 17
21 Clock Monitor Pane........................................................................................................ 18
22 Channel Output Configuration and Diagram............................................................................ 18
23 Saving a Configuration in PPC3.......................................................................................... 19
24 System Overview........................................................................................................... 20
25 ADCx140EVM-PDK Schematics......................................................................................... 21
26 AC-MB Schematics ........................................................................................................ 24
List of Tables
1 TLV320ADCx140 Family ................................................................................................... 3
2 ADCx140EVM-PDK Bill of Materials..................................................................................... 22
3 AC-MB Bill of Materials.................................................................................................... 25
Trademarks
PurePath is a trademark of Texas Instruments.
Audio Toolbox is a trademark of MathWorks.
All other trademarks are the property of their respective owners.

MUX
USB
Optical Input
Stereo Analog
Input External ASI Header
Source
Selector
(SW2)
Audio
Processor
PCM9211Optical Output
To EVM
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1 Introduction
The ADCx140EVM-PDK is an evaluation module (EVM) designed to demonstrate the performance and
functionality of the TLV320ADCx140 family of devices. This family includes the devices shown in Table 1
with differences in performance and function noted.
Table 1. TLV320ADCx140 Family
Device SNR Without DRE (dB) SNR With DRE (dB)
TLV320ADC3140 106 N/A
TLV320ADC5140 108 120
TLV320ADC6140 112 123
2 Hardware Overview
The evaluation kit consists of the TLV320ADCx140EVB daughterboard and the AC-MB motherboard. The
motherboard is used to provide power, control, and digital audio signals to the evaluation module. The
daughterboard contains the TLV320ADCx140 device and its input connections. A detailed functional
overview of the TLV320ADCx140EVB system is described in Section 5.
2.1 AC-MB Settings
2.1.1 Audio Serial Interface Settings
The AC-MB provides the digital audio digital signals to the evaluation module from the universal serial bus
(USB), optical, stereo jack, and external audio serial interface (ASI) header. Figure 1 shows a block
diagram of the ASI routing on the AC-MB.
Figure 1. AC-MB Audio Serial Interface Routing
Switch SW2 on the AC-MB selects the audio serial bus that interfaces with the TLV320ADC5140EVB.
Next to switch SW2, the AC-MB has a quick reference table to identify the audio serial interface source
options and switch settings. The AC-MB acts as the master for the audio serial interface, with three
different modes of operation (see Figure 2): USB, optical or analog, or external ASI.

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2.1.1.1 USB
The serial interface clocks and data are provided from the USB interface. The sampling rate and format
are determined by the USB audio class driver on the operating system. The default settings for the USB
audio interface are 32-bit frame size, 48-kHz sampling rate, BCLK and FSYNC ratio is 256, and the format
is time-division multiplexing (TDM).
The AC-MB is detected by the OS as an audio device with the name TI USB Audio UAC2.0.Figure 2
shows the AC-MB audio setting for the USB mode of operation.
Figure 2. AC-MB USB Audio Setting

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2.1.1.2 Optical or Auxilary Analog Audio Input
Serial interface signals are provided from the PCM9211 digital transceiver, which is capable of sending
digital data to the EVB from an analog input or optical input. Meanwhile, the data from the EVB can be
streamed through the optical output. Figure 3 shows the AC-MB audio setting for the optical and analog
mode of operation.
Figure 3. AC-MB Optical or Auxiliary Analog Audio Setting
The optical output of the AC-MB streams the data captured on the EVM with the format determined by the
input source used. When there is an optical input connected, the LOCK LED must be ON, and the
PCM9211 streams the audio serial interface clocks with the format determined by the optical input frame.
The digital data from the optical input is streamed to the evaluation module. If the optical input is not
connected, the PCM9211 captures the input signal provided through the analog input, and streams the
signal to the evaluation module. This feature can be useful when a digital input DAC is connected to the
AC-MB, providing an analog input for quick evaluation. In Auxiliary Analog Audio mode the audio serial
interface format is fixed to a 24-bit, 48-kHz, I2S mode.

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2.1.1.3 External
In this mode, the audio serial interface clocks for the evaluation board are provided through connector J7
from an external source. This architecture allows the use of an external system to communicate with the
evaluation board, such as a different host processor or test equipment (for instance, Audio Precision
PSIA). The clocks generated from the USB interface and PCM9211 are isolated with this setting. Figure 4
shows the AC-MB audio setting for the external mode of operation.
Figure 4. AC-MB External Audio Setting

Host Processor / Audio Analyzer
MCLK BCLK
FSYNC
DIN DOUT
GND
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Figure 5 shows how to connect the external audio interface, with the bottom row for the signal and the top
row for ground.
Figure 5. AC-MB Connection with External Audio Serial Interface

To EVM
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2.1.2 AC-MB Power Supply
The complete EVM system is powered from a single 5-V power supply. However, the motherboard has
different low-dropout regulators (LDOs) integrated that provide the required power supplies to the different
blocks of the board. Figure 6 shows a block diagram depicting the power structure of the AC-MB.
Figure 6. Power-Supply Distribution of the AC-MB
The AC-MB can be powered from the host computer by using the USB 5-V power supply (VBUS) by
shorting header J5, USB POWER. Additionally, the AC-MB can be powered from an external power
supply connected to terminal J4, EXTERNAL POWER. Header J5 must be open for external supply
operation. The IOVDD voltage for the digital signals that is provided to the evaluation module is generated
on the motherboard from the main power supply (USB or external). The voltage levels available are 1.8 V
and 3.3 V, and can be selected via the J3 header IOVDD. For 1.8-V operation, short pins 2 and 3 of
header J3; for 3.3-V operation, short pins 1 and 2. When the motherboard is fully powered and the power
supplies from the onboard LDOs are correct, the green POWER LED (D3) turns ON. The USB READY
LED indicates that a successful USB communication is established between the AC-MB and the host
computer.

MK1
IN1P IN1M IN2P IN2M IN3P IN3M IN4P IN4M
TLV320ADCx140
IN1P IN1M IN2P IN2M IN3P IN3M IN4P IN4M
J16
J15
J5 J6 J7 J8 J9 J10 J11 J12
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2.2 ADCx140EVM-PDK Hardware Settings
The TLV320ADCx140 evaluation module has several input configuration options and offers extensive
flexibility to allow the user to evaluate the device across multiple operation modes. The different operation
modes are highlighted in this section. The INxP and INxM pins of the TLV320ADCx140 can optionally
connect to an onboard microphone for quick evaluation, and can be optionally configured to bypass the
input decoupling capacitors for evaluating the functionality of the digital microphones or GPIOs. Figure 7
shows the architecture of the inputs to the evaluation module.
Figure 7. TLV320ADCx140EVB Input Architecture

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2.2.1 Line Inputs
For the line input configuration (shown in Figure 8), the TLV320ADCx140 captures the audio signal
provided through terminals J2 (IN1), J3 (IN2), J4 (IN3), and J5 (IN4). The input accepted in this mode is a
differential, 2-VRMS, full-scale audio signal. If a single-ended source is used, the 1-VRMS signal is
supported.
Figure 8. TLV320ADCx140EVB Connection for Line Input Application

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2.2.2 Onboard Microphone Input
For the onboard microphone input configuration (shown in Figure 9), the TLV320ADCx140 records the
audio captured from the microphones located on the bottom edge of the board. MICBIAS is used to power
the onboard microphone, so header J14 must be shorted. There must not be any connections to J1 during
onboard microphone use to preserve the performance of the microphone.
Figure 9. TLV320ADCx140EVB Connection for the Onboard Microphone Test

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3 Software Overview
Texas Instrument's PurePath™ Console 3 (PPC3) graphical development suite is a program that serves
as a platform for many of TI's audio products. PPC3 is designed to simplify the evaluation, configuration,
and debug process associated with the development of audio products.
3.1 PurePath Console 3 Installation
The ADCx140EVM-PDK GUI is an application that installs into the PPC3 framework. PPC3 must be
installed prior to downloading the ADCX140EVM-PDK GUI. To download the PPC3, visit
www.ti.com/tool/PUREPATHCONSOLE and request access. If the PPC3 is already installed, proceed to
Section 3.2.Figure 10 shows the setup directory for the PPC3 installation.
Figure 10. PurePath Console 3 Installation
Open the PPC3 installer and follow the instructions in the setup wizard.

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3.2 ADCx140EVM GUI Installation
3.2.1 Software Setup
Open the PPC3 application in the directory chosen for the GUI installation in Section 3.1.Figure 11 shows
the resulting app center window. Click on the TLV320ADCx140 app tile.
Figure 11. PurePath Console 3 App Center
The TLV320ADCx140 GUI is designed to work with up to four devices at any time. As shown in Figure 12,
choose the 1 device radial button and click New.
Figure 12. Initial GUI Configuration

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As shown in Figure 13, the GUI opens to the Audio Config tab.
Figure 13. Audio Config Tab
Before changing any parameters, check the lower left corner of the PPC3 window, as shown in Figure 14,
to verify that the EVM is connected. If no EVM is detected, the text will read ADCx140 offline. If the EVM
is detected, a Connect button appears. Clicking this button connects the hardware.
Figure 14. Hardware Connect
When the hardware is connected, the Connect button changes to read Disconnect, and the device is
ready to be configured.

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4 Quick Start
Configure the AC-MB for the USB audio (TDM) and the TLV320ADCx140EVB for the onboard microphone
input.
All configurations for this example are done on the audio configuration tab. In the Audio Configuration
block in the lower right portion of the audio configuration tab (as shown in Figure 15), select a word length
of 16 bits, and enable the ASI output channel 1.
Figure 15. Audio Configuration
As shown in Figure 16, select AVDD for the MIC bias voltage and power-up the MIC bias.
Figure 16. MIC Bias Configuration
The default state for the TLV320ADCx140 is standby mode and, with the exception of the channel digital
volume, all device configurations must be done in standby mode. The TLV320ADCx140 does not provide
a digital audio output in standby mode. Figure 17 shows how to change the mode from standby to active.
Figure 17. Standby to Active Mode

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When active mode is enabled, any controls not configurable in active mode are grayed out. These controls
can be changed again when the device is brought out of active mode. Figure 18 shows which controls are
disabled.
Figure 18. Disabled Controls in Active Mode
Audio can now be captured on your PC using the audio program of your choice.

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4.1 Configuring the Audio Serial Bus for the I2S Output
The TLV320ADCx140 features a highly flexible audio serial bus that can be configured to implement a
wide range of data formats. The default format is TDM, however the GUI can be used to change the data
format to I2S. This section describes how to configure the TLV320ADCx140EVM for a 2-channel I2S output
to a USB audio at 16 bits and 48 kHz. Configure the AC-MB for USB audio as described in Section 4. As
shown in Figure 19, select the audio serial bus tab.
Figure 19. Audio Serial Bus Tab
In the ASI format configuration pane (shown in Figure 20), change the protocol format to I2S, and the word
length to 16 bits.
Figure 20. ASI Format Configuration

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When the protocol format is changed to I2S in the GUI, the USB audio processor on the AC-MB also
changes the audio format to I2S. The GUI reads the ASI status register (page 0 register 0x15), providing
the detected sampling rate and BCLK and FSYNC ratio. The ASI status register can also be read
manually in the audio serial bus tab by clicking the Read button, as shown in Figure 21, in the clock
monitor pane.
Figure 21. Clock Monitor Pane
The default slot assignment for channel 1 is left slot 0 and the default slot assignment for channel 2 is left
slot 1. As shown in Figure 22, change the channel 2 slot assignment to right slot 0. The diagram at the top
of the window updates to display the data format and slots selected.
Figure 22. Channel Output Configuration and Diagram
The AC-MB USB audio currently supports only two channels per data line when in I2S mode and the
BCLK and FSYNC ratio is fixed at 64. The EVM is now ready for use with the audio recording program of
your choice.

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4.2 Saving a Configuration
To save a configuration, as shown in Figure 23, click the upper left corner of the PPC3 window and select
Save. The configuration is saved as a .ppc3 file. To load a saved configuration, click the upper left corner
of the PPC3 window and select Open. Navigate to the location of the saved .ppc3 file, and click Open.
Figure 23. Saving a Configuration in PPC3

Digital
Test
Points
GPIO1
Header
DUT Power
Test Points
INPx/INMx
Test Points
Input
Capacitor
Bypass
Header
Input
terminals
On Board
Microphone
EVM
LDO
IOVDD
Select
ACMB
Power Test
Points
JTAG
Port
USB Power
Header
Micro USB
Connector
XMOS
Audio
Processor
Optical
S/PDIF
Output
Stereo
Analog
Input
PCM9211 Digital
Interface
Test Points
ASI
Selector
External
Power
Terminal
EVM
Power
Indicator
DUT
Circuit
On Board
Microphone
Connection
Headers
Main
System
Reset
Optical
S/PDIF
Input
EVM
Power
Indicator
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5 System Overview
Figure 24 shows an overview of the system.
Figure 24. System Overview